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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b98def0569aeb5677204344c284020b8be4362511b442e396afd5010bb6c667' 
  AND token = 'mMqGA4H67zg44Vb+jRcn6J60koh9eQ1sn5y5RwPpZ9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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