SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1200053ee60d2cbac9f00369df007edebcddb9637336d6f37253e8c7afad26e2' 
  AND token = 'fiEA7dqOwTJJdGGja9Gsg204S+oIyrmZqY+G1soDWxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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