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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39db8cd3ddf551e3371485d3035f7caf517609c819156c109deb54588329edc4' 
  AND token = 'GB/Kk3mji7fdQAdkY9hjnPNjnk6IN6SdfzxdV9KbNko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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