SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '091dc0918c783eca86aa189bd557bb117c59a5e9303355730e504ee920fa7a29' 
  AND token = 'mLc3OKRc1ZLQC5TtDIUROn5RNp+QM1gQK37Lwg3U1fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables