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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fa70296629d72af22e06c8379e54113cfb6183c8223f41ef54161e9dded1d8d' 
  AND token = 'XMi7AtCC55dmAZ1OvKQJp33Nk5Wlg2HGtJ3un+ToSUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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