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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45767366dfc73ea21a75db8c0fd3aa560b8048ed9cd510ae90660bec1e7c4872' 
  AND token = 'PdNGFhSXAenrbPnWhgiX02DpSoq7zDo5eybgnwijaMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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