SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a65d752ee3e739f1e18c46b801391a58aa925ad46080fecb9610ef1cc96cd8bf' 
  AND token = 'WZiGxOyfYie9Q+YuK7uK40L5vIK+G/77YqjVhG9nX6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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