SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82cf32d16f7915e9812a598330fe64c50481c9843c4c89cbf7657e7388877831' 
  AND token = 'iticuEP+JyfmlaNA+huBTYYfJTfDqgIatW6Mz7NTdiU=' 
  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