SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba547b9b7bed04f4b8bb6ccf9406ebdd293d546738a0fbbbcb7a7f3da2d6ce6c' 
  AND token = 'jW0yEzlmQ8rsgxEQYgUaO8k9GNhNArYozNr+lMpiaXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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