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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed09425cb162678c279ac983fe0343ee706118308e0304046ce3502d9d792e14' 
  AND token = 'reQ3ARbUE1KFQCX6qs/8DgTJuCyLt107NFHBnKzzvII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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