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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dfd4fda4a9dabfbd6a42986b07b870e2b87dad6d6804658f2e401b5b3940662' 
  AND token = 'LOOtCvx2IIkCgDx9Kh/pEwIOOrjI56qCekzUSAyIzw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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