SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93652c5d6a6105146ccdafb67b20ff33bcf10ffd2b2b9da9f7277266ff3b7fd2' 
  AND token = 'Gt4K8M2pPigJlskgNzBZSXq9Yx2XoqhuZtLQgqCTlUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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