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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bce35f6e9a6adfb8517fd29e979fdaf59da09ef493ea31b785390b5a43a7ec4' 
  AND token = 'f2oRjAPwtiqxf/EVgf1wxTVF9K7+Kz6rBnmLGKmik6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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