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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fd7bf0809e95f9f124f3e153c573f723d157b96cf67d5c7d3fb99af3e968c5b' 
  AND token = 'PAl8V33Ev6TrUfRTxRB1nOdGCMFgOP2n8StKlg/fqtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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