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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '005a240f6fd3a4d30980fb94d57b61755ea41da746c0ed3b9b68a76b5a1d3870' 
  AND token = 'nYASmMmNm7FUbP8b8ZrEw5QtAqJD9DRMIfrGemhcnuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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