SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c8bd7d71bdccf6acef9731a4f211f5749794c453fc052200db36b1ff2569bf' 
  AND token = '+PODdE73hBVZ6I0XHp7uGGJSz0FFwnOsvD5W956KdIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

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