SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cbf9c2be3ec45fd953c48433f4e072e016fff5eadd55c97d159e8adeff521bb' 
  AND token = 'svHYwg1UJ27m+DKckOQM2q8yZwqtKcrPm/hDXykTLKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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