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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af8d814ddf510b2d0ddc1da91a4ddb654e031e0365fbdc04896b7a055c4b860b' 
  AND token = '6Vs9m0wQlbZ1ybjjcze/oBbRSgCcs/wTklnRQsWZ7zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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