Kate McKinnon was not in the closet. She’s been open about being a lesbian for years. She joked about it with Jerry Seinfeld on “Comedians in Cars Getting Coffee” and played lesbian characters with tongue-in-cheek authenticity in skits on “Saturday Night Live.” Even so, her sexual orientation hasn’t been talked about as much as that of some other famous actresses, particularly Ellen DeGeneres, whom McKinnon presented the Carol Burnett Award to on Sunday night at the Golden Globes. The award is a lifetime achievement accolade for her contributions to television. In her speech, McKinnon, seemingly holding back tears, spoke candidly and with humor about being gay and the role DeGeneres played in her understanding of herself, and what it means for L.G.B.T.Q. people to see themselves represented onscreen.