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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e437840028ed35a4c955c68b6db1f2338ff41f9777fe1ff6030e8867bb8ea8' 
  AND token = 'bax+/77ZH1ZZ+CQiQSK8UEN5LaxZz7pxd4AHvPMWSnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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