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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40aa9c2010442f0e0bb99ecf7b5bade777ed823bb00df222416e9cbfcf253d4e' 
  AND token = 'FUOO9jHlO0PXvrADryiPJ//WkHMehquJ+tT/ANkHgSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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