SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9535ad0141f4dc68e9c4df7338b515d26ec8e0251dbdb281e85056672ccff16a' 
  AND token = '7/Z2jy3hCh/GSKNYnFT7Zah4xLSxNl0PlNgtOpxJBoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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