SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '682c5c98b4cb02924b7de5a1a95213e584237ecd48db2294fde441fc82313b80' 
  AND token = 'mmoijrYuwELzZugJMVywAEYqIhWBv5zli2clf7pQ/UI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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