SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23279a3295f0f7d211b1cb6bbca5562eb32dd8abb203ddfe34484729422297b3' 
  AND token = 'VWa+7O8WZG1MRCQLNvTV+/+EIq6FVQdD6gxIvY4np6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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