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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11e2528ccbe9f70f0c351d148f4ca42392c520d1240988dd5b4df0123227560f' 
  AND token = 'bWAUqYukcEKKmug0Dpjx1OT+/2LT80SjsDoYdWuaXGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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