SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3638488bd353f3c4354b5a55b2a4f0c9e57e0116cd2dff79cc6edd267d8c9af5' 
  AND token = 'OJfIDzUfLjchDzcvWlkZC+F0dypWFPnrSjqZ+10uYWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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