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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c0f0dc5811e68e61c37e2304bbd0c959825fcf2ac906f3ec39d4c854ca0ac0' 
  AND token = 'BbkrtJ+pdUUHrG8zH8jmlQpTkPG70Z1nTfsSWFY+FaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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