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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fd9e6e1cf2a4ebd4a22cc57eb67e1dfc8cb47055a681d0d12736d9b5b6604ae' 
  AND token = '1lUJYxAV8d0P835ib46wY4MTlQLVYQeXwLvWIi+gACg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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