SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdf6d440e9546730b21bcd759347da044b72d5bb2b76cd4545b8dc87196d1fff' 
  AND token = 'Z6Jel51ksV4sHLvTAJmFYFmQKo219MUk+PVknCBZZJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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