SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c165b3e5902acbb69b01ff541e46cdada40f62bc1b636deb80cbf48c2a36f4c' 
  AND token = 'cvSTAMTsiLoDwpqlbcpIxlqwlUcwkGmu04jEAMNmA/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

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