SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44805d2c214fdbf74c5128756c1d11ac94a46fb6f617abe7e7730677a5a5d5dd' 
  AND token = 'tl+EmKpdaDBip/IsRPQAajkZH9sX8YTqQJsZyzpZqVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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