SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce0f679401744b73a55d066802f6202c07b5f2c1c7f386cb29070feb281e8552' 
  AND token = 'FgbcdIF7XwTRxDhCPuKk2bCau+RqnjuMdODmfw1tvaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

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