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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc8aa6ac662441ae2225f001f3e6f12a45caf4673a46c5ad3af0bd3513cd039' 
  AND token = 'tDDc+qzzZxIn8Hn7giF5b5fIZeNXUMvmnJTDf1DcGOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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