SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0b0ff4acf1b001162a2637af278b721e651229c0905a8083117554e8ccb56c5' 
  AND token = 'wZ874xm5wJG+BrW+XbQZC0VmapGCQPXui5j8IYLCSJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}