SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0094dbfac2b7b16bb4b7389385db5afc0ee722b2ac00aa947618b627a6f7c1f7' 
  AND token = '/jVVPvWH+dNKLBtlsBVASO0O91Qw9XFs4FUrQXJMvBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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