Lewis scored his fourth goal with 36 seconds remaining to make it 3-0. The Kings got a sustained push from the line of Lewis, Cammalleri and Nicholas Shore, who returned after missing three games with an undisclosed injury. Shore eventually found Lewis for a sharp-angled shot that beat McElhinney.
"The play at the end of the period where they cycle, cycle, cycle and end up scoring a goal, those to me are big momentum-builders for you," Kings coach John Stevens said.
Toffoli scored on the power play at 14:31 of the second period to make it 4-0. After scoring 2:01 later, he has five goals in his past four games.
On his first penalty shot, Matthews beat Quick over his glove with a backhand to cut the Kings lead to 5-1 with 2:10 remaining in the second. Anze Kopitar was called for hooking Matthews on a breakaway.
Rielly scored with 1.5 seconds left in the second to make it 5-2.
Brown redirected Gardiner's shot past Quick eight minutes into the third period on the power play to get the Maple Leafs within 5-3. Stevens challenged that Toronto forward Patrick Marleau interfered with Quick, but the goal was upheld after video review.
Brown has scored a goal in two straight games.
"They had a great start, and turning the puck over like that in the first and second is not going to get it done," Gardiner said.