SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94aa24deb3b47d87a433ff14f2de0edba43e554272c32ae3a9c9d63f2fd5af92' 
  AND token = 'VW2lNjezyOJToTqX/BydgXIGUX8x1fSUIXdBqIu/Bdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

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