SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d5250f058a679ff9c55b6ddb41273ab4f63da9662007b184e8b64128ecd0156' 
  AND token = 'pZFUIg+gua9zF4WX8Us55PkjQzHa+yFwIS/gpHF0Vgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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