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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d24a23d43b33fd14448cd13d45b20c2e13e3b4af956ffd3b693a910d92cdba5' 
  AND token = 'QTsNobtTElzMqC7wp8Axws08q3x5SZXF8K3pfZsrUsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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