SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5df9dd8ee905987cf185c30cf719b066ea8930c5913aba04febde3b9094df17b' 
  AND token = 'Xsk+Zizc8sLUTvfmAjUTqXlnZ19OT9awYRIxv5/eQ9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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