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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9312fe216954497165315b24d963e8b400aedea974982a66d352d087d131cc3a' 
  AND token = '44AEIjEkRsrMR2S7CLhZir8ZAQeEpa77UhI3fEuGWkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00456

JSON explain

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