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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5eee005cc9cfa8b6daa1fe421540e3d10d0ff8e361f8588e109a07b032a48e7' 
  AND token = '8lpcCFM5ywdKbtYOchRzZYE6zE9JHWWxZOsDWYkx+KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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