SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a316d18b2a1160d3ca58272bf77d8c9f25ba3df50a39754deb0813a55a7ce25f' 
  AND token = 'rMlA+y89HDvVYwop8OuykHhCcyvrxoxTDF8o6dEFCdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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