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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '311d040fb97fff73a063159d30b11e52fc57605b91372ef329c691f29860149e' 
  AND token = 'clWXWqjscCO4AviUi3C5LG/SEBpzrAz5YqE5jaK6XZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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