SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '490e5fb60cd59afd239a475123197c0a206b81a2eed689e6092acd25f39545a6' 
  AND token = 'Ha0B/K8fP/3FMbK536fIAxHqi/zza7Ls7pUi42nQtUI=' 
  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