SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c8fb6931678941d63c4d3505a5cd5a82730692b340df2890ed73179444e506' 
  AND token = 'nxIw4mMdwVx+muLWQUpau23s4lvxBryVk7sXHXvqCh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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