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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b243d643215ee70518c4de9f8d5612a2a76be763b9762f13dede23eb1d19ea' 
  AND token = 'u+7yVEqsNRpah1qWOAtSYnSLnPjxbmSp4nzxEzGCAjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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