SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9442e3c37bf956bbd4fa78ef3fff634adc7128e499b97cbfeda6933911ad87e4' 
  AND token = 'h9lWCzvduNBGnLRinyJt3ZvrteyVIFi72AtkE+C5sTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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