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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f68651df62a833a3965e46f63d12dabc77526c4a08076c7a6d72e8da083907e' 
  AND token = '5hpbu8BXOoCNmqWQQ3mxNYMMaJFY19DTtkZ1HKwFib0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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