Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1870904036feca8f82ead5576b5ce437f281be7cb0bb355854239f3c393366f' 
  AND token = '4wTY4HOch+hyfp43yoAK9ByXWf4y1LmJRHEbApbN768=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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