SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5aa9743e27b30b13066dc348c7df8c477e4dbe19162a2881d59770b053f27e6' 
  AND token = 'qFPwUhz7feHI4+YxbjPvLqpVC5A0mEwFO6wR1SI0l8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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