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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd005f28ea7247c6c781070c893f6a10510073d9d159a60c7304a57f5ed107848' 
  AND token = 'bLvpCFAttbO+av0HhEr/G76NbkjzyoaSmIkZ4Pb8SPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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