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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e4258b9595a4532f893ab3122cd2623508c709e0e32631c16f1eef0ef0c0ad8' 
  AND token = '7uwG4Z5FntoFSxW9ENsd6ociqOxr/sbAIn2mxmc1ihQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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