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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4a897e4ac98ce3d7c3e7761ba15336294dea47770b8c8e813a07030e5b176a9' 
  AND token = '4ns4dfkEnoZfo1MAzjsONisQkKwBwU7SMluUHW025/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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