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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feed6084a9fd6afca9b8069221e8a951883cc03785baff320a7b669eeac273f3' 
  AND token = '2dAlJFCPLIJYqlc2Rf15dKHiy9NgdE14sTDASPep2+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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