SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b9f644b3420a96acf267526e4ef82caa8889eeae55475600b3f5002b08f3824' 
  AND token = '7sF1YKZ+fJQnOooeA4y6GT7D5lz/YLbfXbCWAtin+RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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