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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba1d758d8fc40634d37a3949ce14dbe934a70554f13dd1fa4874969f6d3bc20e' 
  AND token = 'itWqcz9ggDgzIbroSTaxZnSQNy4z0EV8l9GdExMfiuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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