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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee0250266b8d78dadb1ac5362daa548f558d69a541e4de13298583d103e76749' 
  AND token = 'ZkSyz0uGog7JZkUE6KAqV2QNNKLG0ZFrzdabH1creu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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