Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ca5f72e5f4914daa4f04fbb7a01a95b2ea60290deda7b2b44b7edb6b305fa6' 
  AND token = '/X1NTsfX9JebevApqlq71HTXUplkfMouoU8XZqWEGhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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