SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e93898af754d44377573e17b525665510be31067e4fc0f22de85ada1fe756eb5' 
  AND token = '9vJkW2GxqHVnPA+YEV2d8Zca6w5msuhDOlsqZgavnHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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