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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee96dd006a89d9c50effbf4a458f40f73da099c51f13016a35d03f1e0af29299' 
  AND token = 'xalUi7K7uDTdd9HRHJ0nlhtzus5H0pwZuE03om/OGhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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