SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b959c4ddfc30e5b9325fa2af87ce45aad78efa32bba8336c36974d86e3bd7145' 
  AND token = 'nnjF/6+5B5olp03Lgyv9GuYgP8VB/dVYNHdH3WiwnsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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