SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e72b76edcb8557c27a76fafa3a4107efdfd6bb297252c02c46cad4c7ac8a6e0' 
  AND token = 'un4nbw9L3okjai2dKw/CWXJi4sTj5MwoKIgxCOJSBzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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