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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0359c843ab01d60af5c4464f4a25ce5a08e7cef1f6779bbaa0a963ce99eb84a' 
  AND token = 'LFL7amgsd5jjv80/my/3IHWyKpQ01Xi4Cw/rhN3/amE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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