SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4586a8e3b7c263d95003c8cbb9a8b5ff4e8c0c72760007d9b33cfccef75f0083' 
  AND token = 'NSuLXLXBQcHUhuu2t6Qqid4Esc6d2fsIj2wOqIGWg7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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