SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74e4bcac88562d3ddd92af4f6d955d7db94934208b5ac54eb81e884645e7f7ef' 
  AND token = 'yn64k/AQBAQoW75BD9nLLcrku5FOMLkiauSQLPTbGhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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