SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '036fd08535984032f6d4e6ce8c26347868b0df085a87296b2dd83be06f422d7c' 
  AND token = 'o1L8wv/CDinCKwd+GjHOeInxTWxWuUVDQLGkHzLCQZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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