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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcfb77935f016d9df9a7d820afaa5f95b28fe9ebb40c995e2ab33d9fe3bd220d' 
  AND token = 'nxNHlZfdvM48liV9CheicMw6yQzmHb8y8OuFij8Wg2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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