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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf4049d520668f1443066f9424476747c8fd50ad005f43af9c1d2949d49579f' 
  AND token = 'gzV76lu+ufe2VOOSMjURiDp7LtZTKXuJsi6j7ZFIZuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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