SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c7068a64b07b6a3817796a3bb32040545bf196dccc202d9fc613c99e86b81dc' 
  AND token = 'wxNYXlB+4QKlr7OeGYNbRRGWIK7gqVbMq3MxkzMHpu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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