SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ce42a9650b2f1dad3ef26f10ded88c54066d041a08d4f3c5b4654f710eaf79' 
  AND token = 'DqFICiggsW9cIEjwEELyCiLD1GIPm/dlD68KuIDh+G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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