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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31b02edbaa7eb8c1321cbf989b5c7b934655a6839e0960cbd28d36ec87d0da82' 
  AND token = 'ZxrCf4IDqEUSXrT93hC7tvK8x5H3yqrB04mWrje1M1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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