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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30cfc09d950f2aca56580018f895cddfb67688f6f98201f3ab7f893b969a1ad' 
  AND token = 'nDlQrJX+DfMYnlTvj6kdWC0GudiRwJm4EcrltAjTNEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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