SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37e359b4235fdfe61d36203734ba777e1fa443123a008e62ab47f50c48153cf5' 
  AND token = '73eBSbP/LafyUBK4oj7TBpitPxv7Hf9GZjFOsNJmYlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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