I want to know if a email adress is member of a Auto-Suppression Lists. (without exporting it as an csv). Is there a chance?
You can query your Auto-Suppression list using SQL.
In this case, try something like this in Query Studio:
SELECT [Email Address] AS Email FROM [YOUR_LISTS_NAME] WHERE [Email Address] = 'email@example.com'
Depending on the result, you'll know if the email adress is in your list or not..
As Adam pointed out on the comments, Auto-Suppression list is basically a Data Extension. Therefore, we can query it, treat it in SSJS as it is: a Data Extension using Data Extensions functions.. (check out Eliot's example)