SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95d2f91e6826f1c6b76c75d56ebe6de8f34df1705d1fe3d8e538d883ba5a08b0' 
  AND token = 'IQUCh5Injt5L1fU6XngIj4OB2aiXyGXldEw5rMg6ARA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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