SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7a2f3f782bd105b5f13e888cd7095732621e05db393cb97d46fe55536ff08a3' 
  AND token = 'BOfIFB+THFRkS+zl4knmAGV0P/67hjJ7t4UbFsk4JBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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