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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8be9af2a9343589389a5c3d15ed212ac3b638ce5a6f649210bf7307faa4fb5d6' 
  AND token = 'YYTk6LFEj5las6OHzY8HXWQeV3uLaTDIxePV63v5siU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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