SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33250c61b4b1c5ba9d03fdba8f3acc7c67d84e58cc8eacfd04fa803501833ae7' 
  AND token = 'VHVqfsWn9L41ujl6cc5LMeiV7+jEkwDkPzM/F3InW4s=' 
  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