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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fa9f2183c8ea527bcc11ef4adbd4ffc849056e05c4c85fcbaffdd498d0444b6' 
  AND token = '1DTl1Mq/nT6U3C/7pYKT8XISO21JSWH+CIfscxohl/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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