SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dab54763bbed0f5dce9b71f4d5f44f6c5fe6987b99930d988f8f7d72ce722497' 
  AND token = 'aAjuz1vgm9Tt5PeKGiNqDmNej9Vs/Kb+22xppZ1VwdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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