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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60cb9b4f150eebb7339f4acb16928348f31599b5b9b5609a2b5bb5312957b36b' 
  AND token = 'YpTgg+weaWWVAQEftmup8stxm8USG1JJUYxSgIjY2fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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