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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44dc95b0379de7b44d06c891325c8e097a4dfd26e03f72fc9b0903a3d95fce82' 
  AND token = 'CA7j5ns/ARxVApbh4QRiyXwYLLoCYWPpFQRsYHEhBkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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