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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e940b09efbd9f2f076f6f4dcdac3420c39a80c338056d76bc5504d5a85fb5c4' 
  AND token = 'Il+qthusfjmhhuTnfhNC4TyztO9Ty9tkKWZ8jiiwYiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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