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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '749fb7170311da853b71f466f1642b4f5ece17dbbf03f0ae5e82e6ca24e2bbf7' 
  AND token = 'szyOvSwAJutQqEknYuIxEJYLAJuwcGke7QxCHk/8xQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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