SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b99a7d11a4a62742a78fd26153acde504026e9669431c2175d665d7ee92aebc' 
  AND token = 'jfpauSh/E15+sZ+zIx8pSDUokBHgaKYQGaypEzqnJEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

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