SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34dbe5b5451907f585b01b6e6f52defd2252b93a0891d7de5e3809a99af57a88' 
  AND token = 'Cf0PpQSrdsdAL8bb4KCLVqPH+neNxmfXRjfCTiWk1/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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