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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1359680be41589ebfa534f4699ece5508d36e3efa1db2040be084fde4cd569b' 
  AND token = '0Xg2Tqnak0eUVgqDs4Ecpi54CvmE5Y5zAaufi8jj5dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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