Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '792e831290bd9a6031c846abf94a7234a2b1ea2cfe6381e3c52faf06e39ca213' 
  AND token = 'C46QRmIEVDuuTOkT+j7qqgkzHAgauAW+OguDirKSKr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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