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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96132e1de67c8c3faab7b00f0ef3cdbaaf1402c7f1b93fb5608e70f8852571d7' 
  AND token = 'O0Z9am7JEy0tKJ33G0Y2h4c6SZzppf+/FyLKWC2vsB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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