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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f2f37a54d3a3f922f5f15f8b5330608aee9cfd822c447ea6b25b911660ae36f' 
  AND token = 'TVLbUdNjTiCY6n9Vvb8EZaOomvaOLuzUQMB3yBslBjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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