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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e72e52f4fade89efe65dd543848ea69a8c4c506c36801f4ea446a31d6e0f5df9' 
  AND token = 'L5LIAdlH6gEQsWsTzZ8ktJC31XYWQU4f2dkaEAFkGmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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