SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bada2c88b1f9a6f71362899be47001a47c9ae60a0f3fbc17cff498d4833af094' 
  AND token = 'DF86keZj+WsZfyL5Fb4wPMK3HxY9JlMLZTlWipKk9u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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