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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b8492b17bb8a58e03718cae2240f9a1fcf2cc480e5849eb10a41effdc98999' 
  AND token = 'MAFYYsaPtWlzW/RYUi7Ufw9qh9OXRqB677IpVeL6Dqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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