Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '192ae7a6927ff0dff137dc3c06b9bd964d6f114b4690ff93b837b07f5e2d7433' 
  AND token = '5LXlhDNOoYOYp0LCt96c10NeMHhWCNTZHy33GyLXQxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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