SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e0f55835f263f033658cb702aaeb7e6e0f0a4f104c63b968e9c177f71b7b9af' 
  AND token = 'c+Rayi/mN4LEqzgqYls5c8gvmYZi5K+MDoCLDlUWdCI=' 
  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