SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c232b8a8782d4c2ce8f5f053ba067549db379bced502d8e9cfcef6351f3fd11' 
  AND token = '+Z9aj+dMWVoXtyLkuL/gw2K3FWJS3Kvn3NmsMl16qas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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