Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f99ff0b978f2986c3f4e21da80b5b4f5f7b816733acce3d9aafcc9f79213d7ff' 
  AND token = 'ZJNokuJOFgxJOI+/TWBzdgNXQANEkltxmHQ9IeHAgzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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