You can check by signing in here
Hover your mouse over My Account/Console at the top of the page, and click on “Security Credentials” After signing in, click on “Continue to Security Credentials” to see the keys listed select “Access Keys (Access Key ID and Secret Access Key)”. If your access keys are no longer active you can reactive them if necessary. If you have a new set of access keys you may need to update your application to use the active set.
In addition, you may also be able to find assistance through the AWS developer forums