SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '654b5bf74bb0544e03d166ae4733fbbe83557176c441b91eb0eb378aae166555' 
  AND token = 'xtElq/h5KDBXtTZhS24iMMI03v6rsLOr/PTw8+3bgfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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