Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5779c18a7ba5c99e25ddf8ae3aa44bb693e42012548e1a00e8edbba24e451dd' 
  AND token = 'RC9ndCn1jEXAqCNfmJRiaciPpSWnIeqoy9+aOu8KCcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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