SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70dec4b44c618c97c871b9952f8e22fbae9f1cb57677e6001a13eafd9bace485' 
  AND token = 'Y8M1RsWL5HvqQ7knPjt5xkmkz+SKa5qW5Jt/je22yYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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