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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '409bda54358bcf9fdf55da83f38565eed0b91054fb7bd306af2c0a7765b5d69f' 
  AND token = 'B7kHXeYYRlEviam0WYM12OQrgmwtcQVIesA82+gvf6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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