SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2bd60038611dcfc349a735f92d86979c45ba8e6a568d04b48a9b52014f551a5' 
  AND token = 'BBm0oIyFhzNsEHHYiXWRFNSOblrJA5KKbHwYv23yAQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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