SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2434e32c7b7a78e677db3176e1d02f210f63cb0b547995fe134d8bd937b32c4' 
  AND token = 'WVehxUUQG/pbsc+T7IP9vzFhSj/L3QStcIy+ZGMrjSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

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