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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ae1349b69b20ecf80e02ce8f91e98dd57e9bd4908378dbb9f0d24d625840ff2' 
  AND token = 'AVaj5WXpx8oE9h2OU+mOjrBMZO732FBDlN8dPAIgHFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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