SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0667d095f5eb46a45db412fb90692dcc622218097bac9f78656c29fd090103ec' 
  AND token = 'jrWXeG8zbhGQBZ6SKw3ZOvudqadlmaallbq1jBGIacg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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