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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ee444e6526e331cd7e5c0fee9c054c092e23eb0f1e8d8cd44e3ffe1a3fe907a' 
  AND token = 'u9RNfnQCurAMqzNSuOCCupI5dXlPbELG+N/9LyuzK6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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