SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7686e2e42d75a17b07ef1a9e6c26b8e0714084e2db79a35e312a988b9b90c5e' 
  AND token = 'qZoK8E4gydP+aVDuFk6gQ7EjMmwThWvYI4bztpr7jCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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