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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3545685e4c18fa252fc91bba1ad5dc39933c24d96cd048f70f529386be35c46' 
  AND token = 'rS5j5yjE9IlxF3B4w3tezsDvdfAE3v1kpp3I6vDyOhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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