SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0649c4d95c094783100696d765507af12831c4b7374eb0eb7f120d1b1efa056' 
  AND token = 'sG3oK40hRL5PPldTQi4aRr6cbnjxCtHQ+vhHip0aVrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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