SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1e35194b5cae6adfbc47f5b9711ad200748a092b06e268fe14d323f7b9b5d96' 
  AND token = 'KGeUXfLVa6N4wxEQe2YIaIAGo9J6fJKHFWvRQSUg+hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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