SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32de2bdbb81ca1393efa333e9319bef8cfc5c7870535d1997fa08484f1d036dc' 
  AND token = 'LZiuYYks2RmbVFpyhopKuQ65KRJK/4vatbSsjP8inXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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