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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '070aed941f54a3058c02673f62b5e12dcc49fbc5bb044fb7a23aa250ffa417a7' 
  AND token = 'RCyLpZXec5Bm64fJLP7iKrNsoAjA9fAneC2tlxEmDOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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