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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04676986b76da822adceb1c7678163d4cddc7ccd14b06030c6711ea1bab8d0a8' 
  AND token = 'PJNKA9pWahWyHbjWedQhrV5y2YUN09OICyOr2qBt0nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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