SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97e8b50f4b98272ec26774bf60f09d115c1e9ec7a437ab5b60323a80129a1df3' 
  AND token = 'yEY4NFBmPFy1t+JQopQyQt5HcH/ytj2AxqrxGphw9lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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