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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c254cc7107254277d8ec370f52ed26bc1fec22accf0f27ee3d5fc5d74e153dc' 
  AND token = 'A4/fEu0yGaNf9+e8wF6RzdLzzwyHWJ9mz1frSUrmldo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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