SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2820635745cbfff0b2de24cae8309dd647499dd333b5eeb3f7003264498179e9' 
  AND token = 'WyYQCrB3hqQ5GIuvk0mV9BBTu63c6aJLNG8JzJ7pbTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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