SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '259922b4f06df91a90a0a9db331fff274fe932b25c462b6cd35d001bb7d92c03' 
  AND token = 'czSr0gY5IhjqJvKPT9ZbxVQ1mddYt++rDgWSCqm3VW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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