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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6acbc4a43ff381c436031d6703630ef688b3d22ae8f93a0d9b9a10581889641f' 
  AND token = 'BGGyazC9B7h15JL6GXoa8WxlxIP9L00hT8Gi9Mc4O+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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