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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5e5025e99a4887fe3ab64dcf6193d531b985196aa201d6d081a36db39975200' 
  AND token = 'aDd30jTpCxskgUXXh4DSRr5z0H7/WWAntFWQ3GS1H+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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