Juninho scored in the 11th and 33rd minutes -- the first on a spectacular free-kick tally -- while Keane scored in the 36th and 92nd minutes for his 12th and 13th goals of the season.
Landon Donovan added two assists for the Galaxy (15-11-4), who won their fourth straight and finished the night alone in the Western Conference's second position.
Terry Dunfield and Luis Silva scored for Toronto (5-18-7).
Jessica Simpson shares three-way kiss with friends in photo
Scarlett Johansson steps out with fiance after pregnancy reveal