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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22ef88f3e9ce39467786d9cabdaef30a6dd97d1e50e939f8d6a4f01ceb78393f' 
  AND token = 'Z5rMqpH3/qqfvzooil3CVtsO6OhCbmKdN4nHqfPrCJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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