SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b3fcd67e6f714eba707424c35ac5c01b6b71e2e1fd8fc942d290c7b2814861a' 
  AND token = 'EJYp8t5oH6oDmifK5D+XdH9zZGJUpDs8YU9fSpVf5zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

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