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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b64c797091bf7e26f75a6ad7fa305e90d417e87ffd42e8e44df87a83ec71d62a' 
  AND token = '0WsRl8dl30Jimd8qH83/wkd+jjSZMMAN8XjST1esDOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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