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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1216e3ac2d64b119066590ed7c312dbb14431198c5afee77bc5553db264d0bb' 
  AND token = 'FwHALImmuzUd/sWEnfFn+y60vHbAKkf8K1Fl/6cWA1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}