SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52da4afa87349155541cfbd2a58d521d28b84c0dc25236588497b4cd689a4947' 
  AND token = 'aDqPClZws/ClqoqJ3za0uWtzq/wbBZmYZAtvrf0cYIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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