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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f7aad831f150585d70356915d9ce7a253aff2eafcb09eecdd8d094da93914d3' 
  AND token = 'xd2LwuB8N+PVsW+D9TlZcmcVHPwXgZercBXcOIbtja4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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