SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0169dd9a639fa2e530a365c102b301a5ffc6d673a56fb461c5d7fbb2bd29288' 
  AND token = 'wrzD+LJy8YS/uI/tBiquMq/c0iZbvBhcPng47Kv7xjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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