SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa77659c02cfdf4af311401bc31200082b680140a59127d96ea1ca82d22394de' 
  AND token = 'YxVDNrO2m0UO125q43iOeSYt3dSIebZQx4vkWRkc860=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

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