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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc8bd0a74d789f93db19adf9c305e25870d031eb15b800435999c40fd23405c9' 
  AND token = 'HEXPeruWP8sYrYIEK3599O3sYraSH27G7qOttZg6bpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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